65267181261 has 12 divisors (see below), whose sum is σ = 94615163292. Its totient is φ = 43354371456.

The previous prime is 65267181191. The next prime is 65267181263. The reversal of 65267181261 is 16218176256.

It can be written as a sum of positive squares in 2 ways, for example, as 3422952036 + 61844229225 = 58506^2 + 248685^2 .

It is not a de Polignac number, because 65267181261 - 2⁹ = 65267180749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65267181263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13087596 + ... + 13092581.

It is an arithmetic number, because the mean of its divisors is an integer number (7884596941).

Almost surely, 2^65267181261 is an apocalyptic number.

It is an amenable number.

65267181261 is a deficient number, since it is larger than the sum of its proper divisors (29347982031).

65267181261 is a wasteful number, since it uses less digits than its factorization.

65267181261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26180460 (or 26180457 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The spelling of 65267181261 in words is "sixty-five billion, two hundred sixty-seven million, one hundred eighty-one thousand, two hundred sixty-one".